Oblique Tooth Closing Wheel for Seed Furrow Fragmentation
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Solution Overview
Problem
Conventional seed closing wheels face issues in high moisture conditions, where soil contraction exposes seeds, and spiked wheels are overly aggressive, disturbing seeds and leaving gaps that result in uneven emergence and lost yield, requiring frequent wheel changes for different soil conditions.
Innovation Solution
A closing wheel design with obliquely extending teeth that fragment and squeeze the seed furrow sidewalls without disturbing the seeds, using a dish-shaped metal body with notched flanges and obliquely projecting teeth to crumble and cover the seeds effectively, preventing seed exposure and ensuring complete coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional closing wheels apply converging pressure outside the sidewalls of the seed furrow to push or squeeze the sidewalls together, then the seeds are covered and protected, but in high moisture situations the soil contraction causes the slit between the two sidewalls to open up and expose the seeds
Solution Approach 1:
The closing wheel is divided into multiple discrete teeth instead of a continuous surface. These teeth independently engage with the soil sidewalls, allowing each tooth to apply localized pressure and fragment the sidewalls effectively. This segmentation enables better adaptation to soil contraction by distributing the closing action across multiple contact points that can independently adjust to soil movement.
Solution Approach 2:
The closing wheel teeth are designed to be flexible and adaptable in their engagement with the soil. The teeth can dynamically adjust their penetration depth and angle based on soil conditions, allowing the wheel to maintain effective seed coverage while adapting to soil contraction in high moisture conditions. The oblique orientation of teeth allows them to engage at varying angles as the wheel rotates.
2Reliability
If spiked closing wheels are used to break down the sidewalls of the furrow and crumble the soil, then there is less of a defined slit in the soil, but the spikes are overly aggressive and penetrate the soil too deeply, disturbing and sometimes dislodging the seeds
Solution Approach 1:
Different portions of the closing wheel have different tooth orientations and angles optimized for specific functions. The obliquely extending teeth are angled to engage the soil sidewalls in a controlled manner, providing localized fragmentizing action at the appropriate depth without excessive penetration. This local optimization ensures that the teeth crumble the sidewalls effectively while stopping short of disturbing the seeds.
Solution Approach 2:
The teeth are designed to provide just enough penetration to effectively crumble the sidewalls and close the furrow, but not so much as to disturb the seeds. The oblique orientation and spacing of teeth ensure that the closing action is sufficient to eliminate the defined slit while remaining conservative enough to avoid excessive penetration that would harm the seeds.
3Device complexity
If substantial gaps are presented between the spikes around the wheel, then the wheel structure is simpler, but the spikes only intermittently engage the soil, resulting in improper or incomplete covering of the seeds
Solution Approach 1:
The closing wheel features multiple discrete teeth spaced around the wheel circumference, providing continuous engagement with the soil as the wheel rotates. This segmentation ensures that teeth are always in contact with the soil at some point during rotation, providing uninterrupted closing action and complete seed coverage, eliminating the gaps present in spiked wheel designs.
Solution Approach 2:
The obliquely extending teeth are arranged around the wheel perimeter to maintain continuous engagement with the soil throughout the rotation cycle. As the wheel turns, different teeth sequentially engage the soil, ensuring that the closing action is continuous rather than intermittent. This continuous action ensures complete and uniform seed coverage without the gaps that would result from spaced-apart spikes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides effective fragmentization and squeezing of seed furrow sidewalls, ensuring seeds are not disturbed and remain covered, improving seed emergence and reducing the need for frequent wheel changes across various field conditions.
Implementation Method 1
A closing wheel design with obliquely extending teeth that fragment and squeeze the seed furrow sidewalls without disturbing the seeds
Implementation Method 2
closing wheels with radially extending spikes have been utilized in an effort to break down the sidewalls of the furrow and crumble the soil
Data Source
AI summary
A seed furrow closing wheel has a generally dish-shaped body defined by a central portion and a notched outer flange portion that circumscribes the central portion and projects obliquely outwardly from the plane thereof. The notched flange portion is configured to present a series of circumferentially spaced, non-radial, obliquely projecting teeth that function to fragment and squeeze together opposite sidewalls of the seed furrow when a pair of the wheels are rolled along opposite sides of the furrow outboard of the furrow itself, crumbling the sidewalls and covering the seeds.